#Mysql uuid full

#Mysql uuid full

MySQL disallows indexing a full value of BLOB, TEXT and long VARCHAR columns because data they contain can be huge, and implicitly DB index will be big, meaning no benefit from index. Reference: MySQL Error 1170 (42000): BLOB/TEXT Column Used in Key Specification Without a Key Length To solve this problem, specify a figure less than 256 as the size for VARCHAR field. VARCHAR can only accepts up to 256 characters, so anything such as VARCHAR(512) will force MySQL to auto-convert the VARCHAR(512) to a SMALLTEXT datatype, which subsequently fails with error 1170 on key length if the column is used as primary key or unique or non-unique index. It happens in a situation such as when you specify VARCHAR column as primary key, but wrongly set its length or characters size. Sometimes, even though you don’t use TEXT or BLOB related type in your table, the Error 1170 may also appear. By default, VARCHAR is limited to a maximum of 255 characters and its limit must be specified implicitly within a bracket right after its declaration, i.e VARCHAR(200) will limit it to 200 characters long only. If you can't do that, and wanting to place a limit on the TEXT or BLOB column, try to use VARCHAR type and place a limit of length on it. The solution to the problem is to remove the TEXT or BLOB column from the index or unique constraint or set another field as primary key. The error will also pop up when you try to convert a table column from non-TEXT and non-BLOB type such as VARCHAR and ENUM into TEXT or BLOB type, with the column already been defined as unique constraints or index. However, MySQL doesn’t support a key length limit on TEXT or BLOB.

So, when using BLOB or TEXT types as an index, the value of N must be supplied so that MySQL can determine the key length. With full BLOB or TEXT without the length value, MySQL is unable to guarantee the uniqueness of the column as it’s of variable and dynamic size. So The error mainly happens when there is a field/column type of TEXT or BLOB or those belong to TEXT or BLOB types such as TINYBLOB, MEDIUMBLOB, LONGBLOB, TINYTEXT, MEDIUMTEXT, and LONGTEXT that you try to make a primary key or index.

The error happens because MySQL can index only the first N chars of a BLOB or TEXT column.